Question: where is mouth of the watercourse of Neva that is of is Gulf of Finland ?
Paraphrase: Where is the mouth of the watercourse of Neva located on the Gulf of Finland?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q645 p:P403 ?s . ?s ps:P403 ?obj . ?s pq:P642 wd:Q14686 }